| 1. | Septal necks are recumbent, connecting rings thin, bullettes small.
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| 2. | The siphuncle is prochoanitic, with septal necks projecting forward.
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| 3. | Septal necks are short in the young, lengthening in the adult.
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| 4. | Septal necks are straight; connecting rings cylindrical and thin.
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| 5. | Septal necks are usually short and do not form a continuous tube.
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| 6. | Upper and lower septal necks are recumbent or narrowly free.
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| 7. | Connecting rings are thin, septal necks cyrtochoanitic ( outwardly flared ).
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| 8. | Septal necks are short and the connecting rings are thin and homogenous.
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| 9. | Siphuncle segments have short septal necks and thick connecting rings.
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| 10. | Septal necks are cyrtochoanitic, outwardly curved; connecting rings are thin.
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